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Reports allocations of arrays with known lengths of zero when there is a constant for that in the class of the array's element type.
As zero-length arrays are immutable, you can save memory reusing the same array instance.
<p><b>Example:</b></p>
<pre><code>
  class Item {
    // Public zero-length array constant that can be reused 
    public static final Item[] EMPTY_ARRAY = new Item[0];
  }
  class EmptyNode {
    Item[] getChildren() {
      // Unnecessary zero-length array creation
      return new Item[0];
    }
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  class EmptyNode {
    Item[] getChildren() {
      return Item.EMPTY_ARRAY;
    }
  }
</code></pre>
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